Malicious PDF — malware analysis report

Static analysis result for SHA-256 af55be1d0674ec6e…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 00:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af7d97f5f3177a63ed1c88c70054c4d4 SHA-1: ddbdce66f9d89f574def898a26d282a3926cb910 SHA-256: af55be1d0674ec6eba32ac9e592b5325e42a2cefcac7533fd16152a915bd3128
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to manipulate search results or distribute malware via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://polesprogettazioni.com/userfiles/files/80453560713.pdf In PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/49f35e4be5c3be78189cff7c3f2ce066/jigoketekeziseguvuvebu.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c863348fa0a---bizovororopokukatonewowam.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kirufafekutezurirovanojud.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/90251220064.pdfIn PDF document text
    • https://synersys.fr/contenu/file/widup.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/mebaxasikapebekomebififan.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160752d2dc7b0f---59956731003.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/ziviwe.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/29d4e75948e3c89c4ba0726e6b317b1d/zikodurasixokikaf.pdfIn PDF document text
    • http://kd-council.com/upfile/files/3719326159.pdfIn PDF document text
    • http://xenangheli.vn/public/files/72848312897.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cda11d518d---namolafu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/83c4fc56b2676fd025c56889662f0ace/pidazofukatetatosetawi.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/44943553898.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/zogowilu.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/97285207716.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5853180fd---38738546425.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/banomokakebubiko.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/ximajosuwetosositumosedu.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/56265402500.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/28s1p55rt02j1fe5u5ko8igm1c/josodoku.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/vototopetomitekepazujesuf.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/vuvafigawuroge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=homophones+worksheet+ks3PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D8 17028 bytes
SHA-256: 290748a949eda353bf285ca55ee4b2d7d27d074824592ec288d00aba80da07b9
font_01_sfnt_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 10556 bytes
SHA-256: 6a399974d78e2dc2a71a9f5fec2503f959b792a7da86909f604caaba04e2b1c5
font_02_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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